Method for improving copper recovery rate of low-grade high-mud copper-molybdenum ore

Abstract

The present application relates to a kind of method for improving the copper recovery rate of low-grade high-mud copper-molybdenum ore, belong to the technical field of mineral processing, the present application includes copper-molybdenum bulk flotation and copper-molybdenum separation process, wherein copper-molybdenum bulk flotation adopts two roughing two cleaning three scavenging + rough concentrate regrinding process, and uses strong collector butyl xanthate for sulfide ore in the second roughing, through the selection of flotation process, the selection and dosage control of reagent in each process step, effectively solve the problem of low recovery rate of target mineral due to insufficient dissociation degree and part of the target mineral with poor floatability in the flotation process;The present application can obtain higher copper recovery rate and copper concentrate grade after flotation of low-grade high-mud copper-molybdenum ore.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically, it relates to a method for improving the copper recovery rate of low-grade, high-mud copper-molybdenum ore. Background Technology

[0002] As the volume of raw ore mined increases, the grade of the raw ore becomes increasingly lower, accompanied by a continuous increase in the amount of surface glacial deposits. This leads to an increase in the mud content and pyrite-pyrrhotite content in the raw ore, resulting in a significant decrease in copper beneficiation recovery rate in the mixed flotation process, with the copper grade of the mixed concentrate falling below 20%. When the copper grade in the raw ore is around 0.35%, the copper beneficiation recovery rate decreases from around 82% to around 79%, and the copper grade of the mixed concentrate decreases from around 21% to around 19%. The existing production process severely restricts the production indicators of mixed flotation.

[0003] As the grade of the raw ore decreases, the target minerals, due to insufficient liberation and poor floatability, cannot be effectively recovered, which is the main reason for the poor recovery rate. Although this problem can be partially solved by further increasing the grinding fineness of the raw ore, increasing the fineness of the raw ore will lead to a decrease in the fineness of the tailings after flotation, resulting in insufficient coarse sand content when the tailings are stored in the tailings dam, which will pose a significant safety hazard to the tailings dam. Therefore, this approach cannot be adopted.

[0004] In addition, there are methods to solve the problems of insufficient liberation and poor floatability by increasing the amount of collector. However, the application of excessive collector will cause the surface of the target mineral to absorb a large amount of collector, forming various hydrophobic substances, which increases the difficulty of inhibition and results in poor separation of copper and molybdenum.

[0005] Meanwhile, low-grade ores currently typically have a high mud content. High mud content (generally defined as -10μm mud content based on its impact on flotation performance) has always been a challenge in mineral processing, and there is still no good solution. Its main impacts are: high reagent consumption, mud dispersing and coating the surface of the target mineral, reducing the floatability of the target mineral, and increasing foam viscosity, which reduces the quality of the concentrate. Summary of the Invention

[0006] In order to overcome the problems existing in the background technology, the present invention provides a method for improving the copper recovery rate of low-grade high-mud copper-molybdenum ore. When flotating low-grade copper-molybdenum ore, it can not only solve the problems of insufficient liberation and poor floatability, but also achieve good copper-molybdenum separation effect.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] The method for improving the copper recovery rate of low-grade, high-mud copper-molybdenum ore includes copper-molybdenum co-concentration and copper-molybdenum separation processes. The copper-molybdenum co-concentration adopts a flotation process of two roughing, two cleaning, three scavenging, and rough concentrate regrinding. Specifically, two roughing processes are performed first, followed by scavenging and cleaning. Butyl xanthate is added as a collector during the second roughing process.

[0009] Preferably, the process of two roughing, two cleaning, three scavenging, plus rough concentrate regrinding includes the following steps:

[0010] (1) The slurry of copper-molybdenum ore after grinding is subjected to the first roughing process to obtain the first roughing concentrate and the first roughing tailings;

[0011] (2) The tailings from the first roughing process are subjected to a second roughing process, in which a collector is added to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0012] (3) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes;

[0013] (4) The tailings from the secondary roughing process are then subjected to three scavenging processes;

[0014] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0015] As a preferred method, the reagents used in the first roughing process are MCO, HCCL, and lime; the reagents used in the second roughing process are butyl xanthate; the reagents used in the first scavenging process are MCO and HCCL; the reagents used in the second scavenging process are MCO and HCCL; and the reagents used in the third scavenging process are MCO and HCCL.

[0016] As a preferred method, the dosage of reagents for the first roughing stage is 82 g / t of MCO, 42 g / t of HCl, and 200 g / t of lime; the dosage of reagents for the second roughing stage is 28 g / t of butyl xanthate; the dosage of reagents for the first scavenging stage is 14 g / t of MCO and 5 g / t of HCl; the dosage of reagents for the second scavenging stage is 8 g / t of MCO and 2 g / t of HCl; the dosage of reagents for the third scavenging stage is 6 g / t of MCO and 2 g / t of HCl; and no reagents are added during the cleaning stage.

[0017] Preferably, the slurry in step (1) has a grading mass concentration of 30%-32% and a grading fineness of -200 mesh 60%-65%.

[0018] As a preferred option, the copper grade of the copper-molybdenum ore is less than 0.35%.

[0019] Preferably, the MCO is a collector and the HCCL is a foaming agent.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention, through the combination of mineral processing procedures and reagents, solves the problem of low recovery rate of target minerals due to insufficient liberation and poor floatability in the flotation process without changing the grinding fineness, and achieves a relatively high copper recovery rate, while also improving the copper grade of the mixed concentrate.

[0022] 2. This invention adds a second roughing process to the existing copper-molybdenum ore flotation process, and adds a strong collector, butyl xanthate, during the second roughing process. This not only solves the problems of insufficient liberation and low recovery rate of some target minerals with poor floatability in the later stage of flotation, but also improves copper recovery and copper concentrate grade, without affecting the copper-molybdenum separation in the subsequent process. Attached Figure Description

[0023] Figure 1 It is the existing copper-molybdenum ore beneficiation process;

[0024] Figure 2 This invention relates to a copper-molybdenum ore co-processing method;

[0025] Figure 3 It is a copper-molybdenum concentrate separation process. Detailed Implementation

[0026] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are all within the scope of protection of this invention.

[0027] The method for improving copper recovery in low-grade, high-mud copper-molybdenum ore includes copper-molybdenum co-concentration and copper-molybdenum separation processes. The copper-molybdenum co-concentration process employs a flotation process consisting of two roughing, two cleaning, and three scavenging stages, plus rough concentrate regrinding, and includes the following steps:

[0028] (1) Copper-molybdenum ore is ground to obtain a slurry with a graded mass concentration of 30%-32% and a graded fineness of -200 mesh of 60%-65%.

[0029] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings; the reagents used in the first roughing are MCO 82g / t, HCCL 42g / t, and lime 200g / t.

[0030] (3) The tailings from the first roughing process are subjected to a second roughing process, in which a collector is added to obtain the second roughing tailings and the second roughing concentrate. The reagent used in the second roughing process is 28 g / t of butyl xanthate.

[0031] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0032] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are MCO 14g / t and HCCL 5g / t. The reagents used in the second scavenging process are MCO 8g / t and HCCL 2g / t. The reagents used in the third scavenging process are MCO 6g / t and HCCL 2g / t.

[0033] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0034] To illustrate the present invention more clearly, the following embodiments will be described in detail.

[0035] The copper-molybdenum ore used in the following examples and comparative examples is the same, with a copper content of 0.35%, a molybdenum content of 0.013%, an Fe2O3 content of 2.69%, and a grinding product -10μm content of 12.69%. Example 1

[0036] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0037] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0038] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are MCO 82g / t, HCCL 42g / t, and lime 200g / t.

[0039] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 20 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0040] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0041] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are MCO 20g / t and HCCL 5g / t. The reagents used in the second scavenging process are MCO 8g / t and HCCL 2g / t. The reagents used in the third scavenging process are MCO 6g / t and HCCL 1g / t. After the three scavenging processes, the tailings are piled up in the tailings dam.

[0042] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0043] Comparative Example 1 (Increasing the amount of MCO used in the first coarse screening)

[0044] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0045] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0046] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are MCO 89g / t, HCCL 45g / t, and lime 200g / t.

[0047] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 20 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0048] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0049] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are MCO 22g / t and HCCL 7g / t. The reagents used in the second scavenging process are MCO 8g / t and HCCL 2g / t. The reagents used in the third scavenging process are MCO 6g / t and HCCL 1g / t. After the three scavenging processes, the tailings are piled up in the tailings dam.

[0050] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0051] Comparative Example 2 (secondary coarse selection omitted)

[0052] A method for copper flotation of low-grade, high-mud copper-molybdenum ore includes the following steps:

[0053] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0054] (2) The slurry is subjected to a roughing process to obtain roughing concentrate and roughing tailings. The reagents used for roughing are MCO 89g / t, HCCL 42g / t, and lime 200g / t.

[0055] (3) The rough concentrate is regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process, and a copper-molybdenum mixed concentrate is obtained after the cleaning process.

[0056] (4) The roughing tailings were subjected to three scavenging processes. The reagents used in the first scavenging were 22 g / t of MCO and 7 g / t of HCCL. The reagents used in the second scavenging were 8 g / t of MCO and 2 g / t of HCCL. The reagents used in the third scavenging were 6 g / t of MCO and 1 g / t of HCCL. After the three scavenging processes, the tailings were piled up in the tailings pond.

[0057] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process. Example 2

[0058] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0059] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0060] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are MCO 82g / t, HCCL 42g / t, and lime 200g / t.

[0061] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 28 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0062] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0063] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are 15 g / t of MCO and 5 g / t of HCCL. The reagents used in the second scavenging process are 8 g / t of MCO and 2 g / t of HCCL. The reagents used in the third scavenging process are 6 g / t of MCO and 2 g / t of HCCL. After the three scavenging processes, the tailings are piled up in the tailings dam.

[0064] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process. Example 3

[0065] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0066] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0067] (2) The slurry is subjected to the first roughing process to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing process are MCO 84g / t, HCCL 42g / t, and lime 200g / t.

[0068] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 28 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0069] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0070] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are 22 g / t of MCO and 5 g / t of HCCL. The reagents used in the second scavenging process are 8 g / t of MCO and 2 g / t of HCCL. The reagents used in the third scavenging process are 6 g / t of MCO and 2 g / t of HCCL. After the three scavenging processes, the tailings are piled up in the tailings pond.

[0071] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process. Example 4

[0072] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0073] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0074] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are MCO 82g / t, HCCL 42g / t, and lime 200g / t.

[0075] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 28 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0076] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0077] (5) The tailings from the secondary roughing process were subjected to three scavenging processes. The reagents used in the first scavenging process were MCO 20 g / t, butyl xanthate 10 g / t, and HCCL 5 g / t. The reagents used in the second scavenging process were MCO 8 g / t and HCCL 2 g / t. The reagents used in the third scavenging process were MCO 6 g / t and HCCL 2 g / t. After the three scavenging processes, the tailings were piled up in the tailings pond.

[0078] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0079] Comparative Example 3 (same as Example 1 except that the collectors for roughing and scavenging were replaced with butyl xanthate).

[0080] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0081] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0082] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are 100g / t butyl xanthate, 50g / t HCl, and 200g / t lime.

[0083] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a strong collector, butyl xanthate, at a rate of 20 g / t, to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0084] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0085] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are 20 g / t of butyl xanthate and 9 g / t of HCl. The reagents used in the second scavenging process are 10 g / t of butyl xanthate and 3 g / t of HCl. The reagents used in the third scavenging process are 8 g / t of butyl xanthate and 2 g / t of HCl. After the three scavenging processes, the tailings are piled up in the tailings pond.

[0086] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0087] Comparative Example 4 (same as Comparative Example 2, except that MCO is replaced with butyl xanthate)

[0088] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0089] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0090] (2) The slurry is subjected to a first roughing process to obtain a first roughing concentrate and a first roughing tailings. The reagents used in the first roughing process are 100 g / t of butyl xanthate, 50 g / t of HCl, and 200 g / t of lime.

[0091] (3) The rough concentrate is regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process, and a copper-molybdenum mixed concentrate is obtained after the cleaning process.

[0092] (4) The roughing tailings were subjected to three scavenging processes. The reagents used in the first scavenging were 30 g / t of butyl xanthate and 9 g / t of HCl. The reagents used in the second scavenging were 15 g / t of butyl xanthate and 3 g / t of HCl. The reagents used in the third scavenging were 10 g / t of butyl xanthate and 2 g / t of HCl. After the three scavenging processes, the tailings were piled up in the tailings pond.

[0093] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0094] Comparative Example 5 (same as Example 1 except that the collector in the secondary coarse selection was replaced with MCO).

[0095] A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore includes the following steps:

[0096] (1) The copper-molybdenum ore was ground to obtain a slurry with a graded mass concentration of 31% and a graded fineness of -200 mesh 62%.

[0097] (2) The slurry is subjected to the first roughing to obtain the first roughing concentrate and the first roughing tailings. The reagents used in the first roughing are MCO 82g / t, HCCL 42g / t, and lime 200g / t.

[0098] (3) The tailings from the first roughing process are subjected to a second roughing process. The second roughing process involves adding a collector MCO at a rate of 20 g / t to obtain the tailings from the second roughing process and the concentrate from the second roughing process.

[0099] (4) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes. No reagents are added during the cleaning process to obtain a copper-molybdenum mixed concentrate.

[0100] (5) The tailings from the secondary roughing process are subjected to three scavenging processes. The reagents used in the first scavenging process are MCO 20g / t and HCCL 5g / t. The reagents used in the second scavenging process are MCO 8g / t and HCCL 2g / t. The reagents used in the third scavenging process are MCO 6g / t and HCCL 1g / t. After the three scavenging processes, the tailings are piled up in the tailings dam.

[0101] In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

[0102] The copper-molybdenum concentrates obtained in the above embodiments and comparative examples were subjected to copper-molybdenum separation using existing copper-molybdenum concentrate separation processes (separation processes are attached). Figure 3 ).

[0103] As attached Figure 3 The commonly used copper-molybdenum concentrate separation process was adopted for copper-molybdenum separation. The copper grade, copper yield, and molybdenum concentrate obtained from the above examples and comparative examples were analyzed. The analysis results are shown in the table below.

[0104] ;

[0105] Note: The HCCL used is a foaming agent, specifically the HCCL foaming agent sold by Kunming Furuit Trade Co., Ltd.

[0106] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore, characterized in that, The process includes copper-molybdenum co-flotation and copper-molybdenum separation. The copper-molybdenum co-flotation adopts a flotation process of two roughers, two cleaners, three scavengers, plus rough concentrate regrinding. Specifically, two roughing processes are performed first, followed by scavenging and cleaning. The collector butyl xanthate is added during the second roughing process. The reagents used in the first roughing process are MCO, HCl, and lime; the reagent used in the second roughing process is butyl xanthate; the reagents used in the first scavenging process are MCO and HCl; the reagents used in the second scavenging process are MCO and HCl; and the reagents used in the third scavenging process are MCO and HCl. The first roughing reagent dosage is 82 g / t MCO, 42 g / t HCl, and 200 g / t lime; the second roughing reagent dosage is 28 g / t butyl xanthate; the first scavenging reagent dosage is 14 g / t MCO and 5 g / t HCl; the second scavenging reagent dosage is 8 g / t MCO and 2 g / t HCl; the third scavenging reagent dosage is 6 g / t MCO and 2 g / t HCl; no reagents are added during the cleaning operation.

2. The method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore according to claim 1, characterized in that, The aforementioned two-roughing, two-cleaning, three-scavenging + rough concentrate regrinding process includes the following steps: (1) The slurry of copper-molybdenum ore after grinding is subjected to the first roughing process to obtain the first roughing concentrate and the first roughing tailings; (2) The tailings from the first roughing process are subjected to a second roughing process. A collector is added during the second roughing process to obtain the tailings from the second roughing process and the concentrate from the second roughing process. (3) The primary roughing concentrate and the secondary roughing concentrate are regrinded and then subjected to two cleaning processes; (4) The tailings from the secondary roughing process are then subjected to three scavenging processes; In each of the above steps, the intermediate ore produced is sequentially returned to the previous process.

3. The method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore according to claim 2, characterized in that, The slurry described in step (1) has a classification mass concentration of 30%-32% and a classification fineness of -200 mesh 60%-65%.

4. The method for improving copper recovery rate in low-grade, high-mud copper-molybdenum ore according to any one of claims 1 to 3, characterized in that, The copper grade of the copper-molybdenum ore is less than 0.35%.

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